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October 1, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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Chemistry
What can be said about the presence of each of these groups of cations in the orginial solution
Tuesday, March 25, 2014 at 10:48am

Chemistry 2
CALCULATE THE SOLUBILITY OF CuBr in 0.69 M NH3
Tuesday, March 25, 2014 at 10:24am

Chemistry 2
What is the solubility of silver chromate in pure water
Tuesday, March 25, 2014 at 10:10am

Chemistry
The Ksp of manganese (II) hydroxide, Mn(OH)2 is 2.00x10^-13. Calculate the solubility of this compound in g/L?
Tuesday, March 25, 2014 at 9:59am

Chemistry
if the pressure read by the barometer is 0.882atm, what is the height of the column of mercury in cm?
Tuesday, March 25, 2014 at 3:26am

Chemistry
I don't really understand how to do this problem, or where to start exactly. Can someone explain to me where to start and how I can solve the problem in a step by step process? Thank you in advance! 1. An acetic acid / sodium acetate buffer solution is also 0.020 M AlCl3. ...
Tuesday, March 25, 2014 at 12:37am

Chemistry
Can someone show and explain to me step by step how to do the problems? I feel like I am doing it incorrectly. a) The solubility of PbI2 is 3.67 mg per mL. What is the Ksp? b) Three drops of 0.20 M potassium iodide are added to 100.0 mL of 0.010 M lead nitrate. Will a ...
Tuesday, March 25, 2014 at 12:33am

Chemistry
Mohr's indicator is 5g/100ml of K2CrO4 in water. What is the concentration of CrO4^2- in the indicator? (in mol/L)
Tuesday, March 25, 2014 at 12:20am

chemistry
Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 2.50 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.43 °C. ...
Tuesday, March 25, 2014 at 12:14am

Chemistry
A 3.0g sample of NaCl is added to a Styrofoam cup of water, and the change in water temperature is 6.5∘C . The heat of solution of NaCl is 3.76 kJ/mol. What is the mass (in g) of water in the Styrofoam cup?
Monday, March 24, 2014 at 10:50pm

Chemistry
Acetylene(C2H2) torches are used in welding. How much heat (in kJ) evolves when 2.0L of C2H2 (d=1.0967kg/m3) is mixed with a stoichiometric amount of oxygen gas? The combustion reaction is C2H2(g)+52O2(g)→2CO2(g)+H2O(l), ΔH∘=−1299.5kJ
Monday, March 24, 2014 at 10:49pm

Chemistry
3.25g of zinc was added to 50cm^3 of a 4.0 molar dm^-3 HCl. When the reaction was completed the temperature rose by 28 degrees celcius. (a) Is the reaction exothermic or endothermic? (b)All the zinc dissolve in this reaction. How many moles of zinc reacted? (c) How many moles ...
Monday, March 24, 2014 at 9:20pm

chemistry
how much heat is required when 6.00g of water is melted at its melting point
Monday, March 24, 2014 at 5:15pm

chemistry
Calculate the resulting pressure if 4.50 liters of nitrogen at 35 degrees Celsius and 790 torr and 3.7 liters of oxygen at 15 degrees Celsius and 750 torr are pumped into a 1.00 liters container at 25 degrees celsius. Assume ideal gas behavior.
Monday, March 24, 2014 at 4:27pm

Chemistry: Check my answers?
Write “yes” or “no” below if the chemical equation is balanced or not. 1. 2H2 + O2 ---> 2H2O 2. S8 + 12O2 ---> 8SO3 3. HgO ---> Hg + O2 4. Zn + HCl ---> ZnCl2 + H2 5. 2Na + 2H2O ---> 2NaOH + H2 6. 2Al + 3FeO ---> Al2O3 + 3Fe 7. 4Si2H3 + ...
Monday, March 24, 2014 at 1:55pm

chemistry
Distilled water normally contains dissolved CO2. When preparing NaOH standard solutions, it is important to use CO2 free distilled water. How does dissolved CO2 in distilled water affect the accuracy of the determination of a NaOH solution’s concentration?
Monday, March 24, 2014 at 1:36pm

Chemistry
What is the molarity of a 5.00 x 102 ml solution containing 2490 g of KI? How many moles of LiF would be required to produce a 2.5 M solution with a volume of 10.5 L? How many grams of NaI would be used to produce a 2.0 M solution with a volume of 10.00 L? Very confused on ...
Monday, March 24, 2014 at 12:19pm

Chemistry
Arsenic acid (H3AsO4) is a triprotic acid with Ka1 = 5 ✕ 10-3, Ka2 = 8 ✕ 10-8, and Ka3 = 6 ✕ 10-10. Calculate [H+], [OH ‾ ], [H3AsO4], [H2AsO4‾ ], [HAsO42 ‾ ], and [AsO43 ‾ ] in a 0.16 M arsenic acid solution.
Monday, March 24, 2014 at 10:42am

Chemistry
Your muscles are switched on by releasing calcium ion from the sarcoplasmic reticulum that surrounds your muscle bundles. The Ca2+ binds to a muscle fiber, and that triggers the contraction. To relax the muscle again, Ca2+ must be pumped out, so that the concentration in...
Monday, March 24, 2014 at 8:24am

chemistry
Distilled water normally contains dissolved CO2. When preparing NaOH standard solutions, it is important to use CO2 free distilled water. How does dissolved CO2 in distilled water affect the accuracy of the determination of a NaOH solution’s concentration? would it be too...
Monday, March 24, 2014 at 7:51am

chemistry
2. When preparing a NaOH solution, a student did not allow the NaOH pellets to completely dissolve before standardizing the solution with KHP. However, by the time the student refilled the buret with NaOH to titrate the acetic acid, the remaining NaOH pellets had ...
Monday, March 24, 2014 at 7:50am

Chemistry
How many moles of hydrochloric acid are required to react with 2.57 moles of calcium hydroxide in a neutralization reaction?
Monday, March 24, 2014 at 6:10am

chemistry
In an experiment of hydrogen reacts with 110.0 g nitrogen gas, producing 100.1 g ammonia. a) How many grams of nitrogen will be left over?
Sunday, March 23, 2014 at 11:56pm

College Chemistry
A solution is saturated in both nitrogen gas and sodium iodide at 50 degrees C . When the solution is cooled to 25 degrees C what is most likely to occur?
Sunday, March 23, 2014 at 11:42pm

Chemistry
What factors control the bond length in a covalent bond
Sunday, March 23, 2014 at 10:21pm

chemistry
Consider the titration of 50.0 mL of 0.200 M HOCl by 0.200 M KOH for the next five questions (Ka for HOCl = 3.5 x 10-8). Calculate the pH after 150.0 mL of KOH has been added.
Sunday, March 23, 2014 at 9:50pm

chemistry
Calculate the concentration in % (m/m) of a solution containing 20.5 g of LiF dissolved in 340.0 g of H2O. a.1.14% (m/m) b.5.69% (m/m) c.6.03% (m/m) d.6.42% (m/m)
Sunday, March 23, 2014 at 8:58pm

chemistry
In which of the following pairs of ionic compounds are both members of the pair soluble in water? a.AgNO3 and AgCl b.LiOH and Li2SO4 c.PbSO4 and BaCO3 d.NH4I and Sn3(PO4)2
Sunday, March 23, 2014 at 8:53pm

AP Chemistry
What is the entropy change for the vapor- ization of 2.2 mol H2O(ℓ) at 100◦C and 1 atm? H = 40700 J/mol.
Sunday, March 23, 2014 at 7:43pm

Chemistry
if a glass of ice water is at equilibrium, what is its temperature?
Sunday, March 23, 2014 at 7:27pm

Chemistry
explain equilibrium in terms of the collision theory
Sunday, March 23, 2014 at 7:02pm

Chemistry
For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction 2NO(g) + O2(g) --> 2NO2(g) the standard change in Gibbs free energy is ΔG° = -69.0 kJ/mol. What is ΔG for this reaction at 298 K when the ...
Sunday, March 23, 2014 at 5:43pm

Chemistry
How to use the octet rule to predict the formula of the simplest compound formed from hydrogen and selenium, (Write the formula with hydrogens)?
Sunday, March 23, 2014 at 3:39pm

Chemistry
What factors control the bond length in a covalent bond? Select all that apply. -It involves the attraction between the two nuclei involved in the bond. -It involves the attraction between the electrons in the bond and the nuclei of the atoms. -It involves the repulsion ...
Sunday, March 23, 2014 at 3:37pm

Chemistry
When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) Delta G^o = 290.3 kJ/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous. What is the ...
Sunday, March 23, 2014 at 3:10pm

chemistry
1. When performing this experiment, a student mistakenly used impure KHP to standardize the NaOH solution. If the impurity is neither acidic nor basic, will the percent by mass of acetic acid in the vinegar solution determined by the student be too high or too low? Justify ...
Sunday, March 23, 2014 at 3:05pm

Chemistry for health science
Considering the neutralization reaction when nitric acid reacts with solid iron(II)carbonate. What is the minimum volume of 2.00 M HNO3 necessary to react completely with 1.06 kg of solid iron(II) carbonate, FeCO3 ?
Sunday, March 23, 2014 at 1:33pm

chemistry
A piece of magnesium weighing 48 grams is burned in air n 80 gram of magnesium oxide is formed. what mass of oxygen combined with the magnesium is in the reaction?
Sunday, March 23, 2014 at 10:26am

Chemistry
I need to balance the equation of the reactants NaHCO3->CuCl2 please help me.
Sunday, March 23, 2014 at 9:32am

Chemistry
What is the total heat evolved when a saturated solution of boric acid (H3BO3) in water is cooled from 100C to 20C? Note the specific heat capacity of the saturated solution is approximately that of water in that temperature range (4.20 J/g.K) and the specific heat capacity of...
Sunday, March 23, 2014 at 5:45am

Chemistry
When 24g of Magnesium reacts with oxygen gas the only product is magnesium oxide. If 40g magnesuim is produced how much oxygen was consumed?
Saturday, March 22, 2014 at 9:33pm

Chemistry - check answers
1) Which element has the largest first ionization energy? A) Rb, B) Fr, C) K, D) Na, E) Mg Answer: E 2) Which has the highest electronegativity? A) Na, B) Cs, C) Si, D) Te, E) Cl Answer: E 3) In which of the following are the bonds arranged in order of increasing polarity? A) ...
Saturday, March 22, 2014 at 8:22pm

Chemistry
The decomposition of hydrogen iodide on a gold surface at 150 oC HI(g) ½ H2(g) + ½ I2(g) is zero order in HI. In one experiment, when the initial concentration of HI was 0.206 M, the concentration of HI dropped to 3.71E-2 M after 898 seconds had passed. Based on ...
Saturday, March 22, 2014 at 7:45pm

Chemistry
The decomposition of hydrogen iodide on a gold surface at 150 oC HI(g) ½ H2(g) + ½ I2(g) is zero order in HI with a rate constant of 1.20E-4 Ms-1. If the initial concentration of HI is 0.575 M, the concentration of HI will be 0.116 M after how many seconds have ...
Saturday, March 22, 2014 at 7:03pm

Chemistry
The decomposition of hydrogen iodide on a gold surface at 150 oC HI(g) ½ H2(g) + ½ I2(g) is zero order in HI with a rate constant of 1.20E-4 Ms-1. If the initial concentration of HI is 0.575 M, the concentration of HI will be 0.116 M after seconds have passed.
Saturday, March 22, 2014 at 7:02pm

Chemistry
an extremely soluable salt is added to water, and all of it dissolves. is it at equilibrium? explin.
Saturday, March 22, 2014 at 6:47pm

chemistry
calculate the freezing point of an aqueous solution of 15.5 grams of glucose dissolved in 150 grams of water
Saturday, March 22, 2014 at 5:32pm

chemistry
Calculate the molar conc. Of ethanoate acid needed to prepare ethonoic buffer of ph 6.8 using 0.5 molar solution of sodium ethanoic.pka of acid 0..127
Saturday, March 22, 2014 at 1:16pm

Chemistry
Complete and balance the equation for this reaction in basic solution? Redox reaction Cr is oxidized to CrO42– and Fe3 is reduced to Fe2...? For a particular redox reaction Cr is oxidized to CrO42– and Fe3 is reduced to Fe2 . Complete and balance the equation for ...
Saturday, March 22, 2014 at 9:45am

Chemistry
1.350g of insoluble carbonate, MCO3 was dissolved in 250cm^3 of a 0.203 mol/dm^3 HCL solution. The resulting solution was boiled off to remove all carbon dioxide produced. 25.0 cm^3 of the solution required 24.10cm^3 of 0.100 mol/dm^3 sodium hydroxide solution. Determine the ...
Saturday, March 22, 2014 at 9:39am

Urgent Chemistry
The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{-15}\; g) and is swimming at a velocity of vv = 7.00ìm/s\mu m/...
Saturday, March 22, 2014 at 6:42am

chemistry
Given these standard reduction potentials at 25oC: Cr3+ + e- -> Cr2+ (E1^o = -0.407V) Cr2+ + 2e- -> Cr(s) (E2^o = -0.913V) Determine the standard reduction potential at 25oC for the half-reaction equation: Cr3+ + 3e- -> Cr(s) This seems like a really simple problem (...
Friday, March 21, 2014 at 11:46pm

Chemistry
carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constanst (K) for this reaction (delta Gf values: H2CO3= - 616.1, H2O= - 237.1, CO2= - 394.4) . Carbonic acid then ionizes in water (Ka1= 4.5 x 10^-7). Ignoring Ka2, estimate (K) ...
Friday, March 21, 2014 at 4:47pm

Chemistry-Repost for DrBob222
500 ml of a buffer solution with ph=2.10 must be prepared using .4 M HNO2 and solid KNO2. The ka value of HNO2 is 4e-3. a.) What mass of KNO2 should be added to 3 L of the HNO2 to make the buffer? b.) What is the buffer's pH after 150 ml of .5 M HNO3 is added? Your answer ...
Friday, March 21, 2014 at 2:34pm

Chemistry
Given that 20 ml of a weak acid (HA) was titrated with NaOH and the titration curve of pH vs titrant volume in ml is given, find the initial concentration of the acid? The problem gives the full titration curve starting at pH=2.2 at 0 ml added and with the equivalance pt at pH...
Friday, March 21, 2014 at 2:11pm

Chemistry-Repost for DrBob222
A sample of C60O3 decomposes with an activation energy of 50 kg/mol, an Arrehnius pre-factor of 2e10 s-1 and a k value of .04 s-1. How long does it take for a 25 mg sample at 25 degrees C to produce 10 mg. Your response was is that C60O<suh>3 or what? And I thought ...
Friday, March 21, 2014 at 2:06pm

Chemistry
What is the pH of a solution prepared by mixing 24.6 g sodium acetate and 50 mL of 2.5 M acetic acid in a 500 mL flask and filling to volume
Friday, March 21, 2014 at 12:58pm

Chemistry-Repost for DrBob222
The reaction OH- + NH4+ = H20 + NH3 is kinetically first order in both reactants' concentrations. The rate constant is 2e10 1/M s. If 50 ml of .01 M NaOH is mixed with 50 ml of .01 M NH4CL, find the time required for the OH- concentration to reach 1e-4 M. Your answer: It ...
Friday, March 21, 2014 at 10:39am

Chemistry-Repost for DrBob222
My question was: A saturated solution of MgF2 at 23 degrees C was prepared by dissolving solid MgF2 in 1 L water. The Ksp of MgF2 is 1.5e-5. a.)Calculate the mass of MgF2 dissolved. b.) When .1 mols of solid KF was dissolved in the MgF2 solution, precipitation was observed. ...
Friday, March 21, 2014 at 10:34am

Chemistry
The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{-15}\; g) and is swimming at a velocity of vv = 7.00ìm/s\mu m/...
Friday, March 21, 2014 at 6:31am

Chemistry
The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{-15}\; g) and is swimming at a velocity of vv = 7.00ìm/s\mu m/...
Friday, March 21, 2014 at 6:31am

Chemistry
The following reaction has the following standard thermodynamic parameters: Reaction: C(g) + D(g)----> E(g) Delta H rxn=-26.1kJ/mol and Delta S rxn=-69.8J/(mol*K). Calculate the temperature at which the reaction becomes nonspontaneous.
Friday, March 21, 2014 at 1:32am

chemistry
The pressure in an automobile tire is 1.85 atm at 27.0°C. What will be the pressure if the temperature increases to 38.0°C?
Thursday, March 20, 2014 at 10:23pm

Chemistry
HClO(aq) + H2O (l) <> H3O+ (aq) + ClO-(aq) Calculate the value of ΔGrxn at 25 °C for hypochlorous acid when [ClO-]=[H3O+]=5.69x10^-5 M [HClO] = 1.340 M Previously calculated a ΔGºrxn of 42.20 kJ/mol Q = [5.69x10^-5] / [1.340] = .00004245 M equation ...
Thursday, March 20, 2014 at 9:05pm

Chemistry HELP PLEASE!!
write the oxidation and reduction half-reactions that occur at the anode and cathode, respectively, when MgCl2 liquid is electrolyzed using inert electrodes. HELP PLEASE!!!
Thursday, March 20, 2014 at 8:15pm

Chemistry
The mechanism for NH2NO2=N2O+H2O occurs in three steps: step 1: NH2NO2=NHNO2- + H+ (forward and reverse reactions are fast) step 2: NHNO2-=N2O+OH- (slow) step 3: H+ + OH-=H20 (very fast) What is the rate law for d[N2O]/dt as determined by the mechanism?
Thursday, March 20, 2014 at 6:33pm

Chemistry
500 ml of a buffer solution with ph=2.10 must be prepared using .4 M HNO2 and solid KNO2. The ka value of HNO2 is 4e-3. a.) What mass of KNO2 should be added to 3 L of the HNO2 to make the buffer? b.) What is the buffer's pH after 150 ml of .5 M HNO3 is added?
Thursday, March 20, 2014 at 6:06pm

Chemistry
A sample of C60O3 decomposes with an activation energy of 50 kg/mol, an Arrehnius pre-factor of 2e10 s-1 and a k value of .04 s-1. How long does it take for a 25 mg sample at 25 degrees C to produce 10 mg.
Thursday, March 20, 2014 at 6:03pm

chemistry
if you had 0.028 moles of copper sulfide, how many grams would you have?
Thursday, March 20, 2014 at 5:03pm

CHEMISTRY
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
Thursday, March 20, 2014 at 3:55pm

CHEMISTRY
An electron undergoes a transition from an n=3 to an n=1 stationary state and red light is released. Which of the following forms of electromagnetic radiation could be released for an n=2 to n=1 electron transition within the same atom? -blue visible light -yellow visible ...
Thursday, March 20, 2014 at 3:25pm

chemistry
Cabbage Juice Titration Lab connexus
Thursday, March 20, 2014 at 3:20pm

CHEMISTRY
CaCO3(s)+2HCl(aq)>CaCl2(aq)+H2O(l)+CO​2(g) how many grams of calcium chloride will be produced when 30 g of calcium carbonate are combined with 13 g of hydrochloric acid? Which reactant is in excess and how many grams of this reactant will remain after the reaction is...
Thursday, March 20, 2014 at 2:37pm

General Chemistry
A piston has an external pressure of 7.00 atm. How much work has been done in joules if the cylinder goes from a volume of 0.130 liters to 0.650 liters. Express your answer with the appropriate units.
Thursday, March 20, 2014 at 12:17pm

logic-math
Calculate the truth value (f or V) a. Is it true that if (the Papaya is a fruit from the Caricaseas or the Pitahaya is the fruit of a plat from the Cactaseas) then (el Cohombro is a fruit of a plant from the family of the Cucurbitaceas or the Nisper is a fruit of a tree from ...
Thursday, March 20, 2014 at 12:01pm

chemistry
Calculate the percent yield for an experiment in which 46.9 g of SO3 was produced upon the reaction of 51.2 g of SO2 with 25.0 g O2
Thursday, March 20, 2014 at 9:53am

Chemistry
If your Copper(II)sulfate solution contains 0.8 grams of Cu and you recovered 0.76 grams of it, what would be the percent yield?
Thursday, March 20, 2014 at 9:38am

Chemistry
The Ksp of tin(II) hydroxide, Sn(OH)2, is 5.45 × 10-27. Calculate the solubility of this compound in g/L.
Thursday, March 20, 2014 at 1:09am

chemistry
A gas mixture contains 75.2% nitrogen and 24.8% krypton by mass. What is the partial pressure of krypton in the mixture if the total pressure is 853mmHg ?
Thursday, March 20, 2014 at 12:20am

Chemistry
A heliox deep-sea diving mixture contains 2.0 g of oxygen to every 98.0 g of helium.What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.9atm ?
Thursday, March 20, 2014 at 12:16am

Chemistry
In a heating and cooling curve, I understand that the flat part means that the bonds are either forming or breaking, depending on if the input of energy is increasing or decreasing, but what is happening to the bonds in the slanted parts? Thanks!
Wednesday, March 19, 2014 at 11:29pm

chemistry
How many moles of sodium chloride can be produced if 29g of Magnesium Chloride are reacted in the reaction 2NaNO3 + MgCl> 2NaCl+Mg (NO3)2?
Wednesday, March 19, 2014 at 10:46pm

Chemistry
The energies, E, for the first few states of an unknown element are shown here in arbitrary units: n= 1, E=-21 n=2, E=-9 n=3, E=-4 n=4, E=-3 ...,... infinity, 0 A gaseous sample of this element is bombarded by photons of various energies (in these same units). Match each ...
Wednesday, March 19, 2014 at 10:33pm

chemistry
*the molar solubility of BaCo3 in 0.50M Bacl2 solution IS?ksp(1.6*10^-6) I CALCULATED AND GOT 3.2*10^-9 WANT TO MAKE SURE IF IT CORRECT
Wednesday, March 19, 2014 at 10:24pm

Chemistry
1. A chemist prepares a solution by dissolving 4.603 g of NaNO3 in enough water to make 200 mL of solution. What molar concentration of sodium nitrate should appear on the label? Answer in units of M 2.If the chemist mistakenly makes 225 mL of solution instead of the 200 mL, ...
Wednesday, March 19, 2014 at 9:57pm

CHEMISTRY
What is the mass in grams of one Mole of water?
Wednesday, March 19, 2014 at 9:54pm

Chemistry
If 689000 J of energy are added to 4.00 L of water at 284 K, what will the final temperature of the water be? Answer in units of K
Wednesday, March 19, 2014 at 9:50pm

Chemistry
Determine the specific heat of a material if a 34.7 g sample absorbed 45.2 J as it was heated from 293 K to 318 K. Answer in units of J/g · K Your answer must be within ± 2.0%
Wednesday, March 19, 2014 at 9:48pm

Chemistry
what is the mass in grams of one molecule of water?
Wednesday, March 19, 2014 at 9:40pm

Chemistry
How do you find the initial concentration of the acid give the titration curve of a weak acid-strong base titration?
Wednesday, March 19, 2014 at 9:22pm

Chemistry
Calculate the pH of the solution that results from mixing 30.0 mL of 0.050 M HCN(aq) with 70.0 mL of 0.030 M NaCN.
Wednesday, March 19, 2014 at 9:20pm

AP Chemistry
A solution is 1.0M in AgNO3 and Fe(NO3)2.in the electrolysis of this solution using inert electrodes, the voltage is gradually increased. What is the order in which the substances in the solution would plate our or react at the cathode ? Assume that the overvoltage of hydrogen...
Wednesday, March 19, 2014 at 8:09pm

CHEMISTRY
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
Wednesday, March 19, 2014 at 7:25pm

Organic Chemistry
Draw every stereoisomer for 1-bromo-2-chloro-1,2-difluorocyclopentan​e. Use wedge-and-dash bonds for the substituent groups, and be sure that they are drawn on the outside of the ring, adjacent to each other.
Wednesday, March 19, 2014 at 6:44pm

Chemistry
Calculate the change in mass of the In electrode after the cell supplies 100 mA of current for 10 minutes. The balanced redox reaction is 2In+Cl2=2In+ + 2Cl-. I understand the idea behind the question, I just don't know if I should use 1 mol In per 1 mol e- or 1 mol In per...
Wednesday, March 19, 2014 at 6:27pm

Chemistry
The reaction OH- + NH4+ = H20 + NH3 is kinetically first order in both reactants' concentrations. The rate constant is 2e10 1/M s. If 50 ml of .01 M NaOH is mixed with 50 ml of .01 M NH4CL, find the time required for the OH- concentration to reach 1e-4 M.
Wednesday, March 19, 2014 at 6:04pm

Chemistry
A saturated solution of MgF2 at 23 degrees C was prepared by dissolving solid MgF2 in 1 L water. The Ksp of MgF2 is 1.5e-5. a.)Calculate the mass of MgF2 dissolved. b.) When .1 mols of solid KF was dissolved in the MgF2 solution, precipitation was observed. Find the mass of ...
Wednesday, March 19, 2014 at 5:59pm

Chemistry
What is the concentration of hydronium ions in a solution that is 0.12 M HBrO(aq) and 0.160 M NaBrO(aq)?
Wednesday, March 19, 2014 at 5:56pm

Chemistry
I need to find the rate law of a reaction but ive only done so when factors cancel out, this one has all different numbers and im not quite sure what to do with it. It has time taken every second (which im assuming are the different trials) and different concentrations of OH...
Wednesday, March 19, 2014 at 5:47pm

chemistry
Calculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation. a. [OH-] = 2.8 x 10-7 M b. [OH-] = 8.8 x 10-3 M c. [OH-] = 2.4 x 10-11 M everytime I do the problem In the calculator I get system error someone please ...
Wednesday, March 19, 2014 at 5:05pm

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